<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .container {
        width: 500px;
        height: 500px;
        margin: 0 auto;
        display: flex;
        flex-flow: column;
        align-items: center;
        justify-content: center;
        filter: contrast(20);
        background-color: #fff;
      }
      .box1 {
        width: 150px;
        height: 150px;
        background-color: #00f;
        border-radius: 50%;
        filter: blur(10px);
        animation: move 2s linear infinite alternate-reverse;
      }
      .box2 {
        width: 50px;
        height: 50px;
        background-color: #00f;
        border-radius: 50%;
        filter: blur(10px);
        animation: move 2s linear infinite alternate;
      }

      @keyframes move {
        from {
            transform: translateY(-100px);
        }
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="box1"></div>
      <div class="box2"></div>
    </div>
  </body>
</html>

